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专限时训练(三十三) [阅读填空(三)] (限时：每篇15分钟) A An experimental solarpowered plane landed safely Thursday after completing its first 24hour test flight, proving that the aircraft can collect enough energy from the sun during the day to stay aloft(在空中) all night. Pilot Andre Borschberg eased the Solar Impulse onto the runway at Payerne airfield about 30 miles southwest of the Swiss capital Bern at exactly 9 a．m. (3 a．m. EDT) Thursday. Helpers rushed to stabilize the pioneering plane as it touched down, ensuring that its massive 207foot wingspan didn’t scrape the ground and topple(倾倒) the craft. The record feat(壮举) completes seven years of planning and brings the Swissled project one step closer to its goal of circling the globe using only energy from the sun. “We achieved more than we wanted. Everybody is extremely happy，”Borschberg told reporters after landing. Previous flights included a brief “flea hop” and a longer airborne test earlier this year, but this week’s attempt was described as a “milestone” by the team. The team said it had now demonstrated that the singleseat plane can theoretically stay in the air indefinitely, recharging its depleted batteries using 12,000 solar cells and nothing but the rays of the sun during the day. But while the team said this proved that emissionsfree air travel was possible, it didn’t see solar technology replacing conventional jet propulsion(喷气推进) any time soon. Instead, the project’s overarching purpose was to test and promote new energyefficient technologies. | 
